Q. An ammeter and a voltmeter of resistance $R$ are connected in series to an electric cell of negligible internal resistance. Their readings are $A$ and $V$ respectively. If another resistance $R$ is connected in parallel with the voltmeter
A) Both $A$ and $V$ will increase
B) Both $A$ and $V$ will decrease
C) $A$ will decrease and $V$ will increase
D) $A$ will increase and $V$ will decrease
Explanation
(d) After connecting a resistance $R$ in parallel with voltmeter its effective resistance decreases. Hence less voltage appears across it $i.e.\ V$ will decreases. Since overall resistance decreases so more current will flow $i.e.\ A$ will increase
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.